Payment gateway for 2b2 marketplaces - is it useful?

We're building a checkout with B2B marketplaces in mind that might need to support complex payment options such as high volume invoices, ACH or checks beyond the typical credit card payment. (On top we also do factoring so end users can pay 30/60 days later while that marketplace gets paid immediately)

I'd love some feedback from any of you folks running a platform catering to a more B2B audience and what challenges with payments you're trying to solve. (we're VC-backed so aren't truly indie ;))

https://www.getbalance.com/